<table border="1" mj_done="true">
    <thead>
    <tr>
        <th>序号</th>
        <th>编号</th>
        <th>题目</th>
        <th>通过率</th>
        <th>难度</th>
        <th>出题指数</th>
        <th>出现频率</th>
    </tr>
    </thead>
    <tbody>
    <tr>
        <td>1</td>
        <td>655</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/print-binary-tree/">输出二叉树</a></td>
        <td>53.7%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.423</td>
    </tr>
    <tr>
        <td>2</td>
        <td>670</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/maximum-swap/">最大交换</a></td>
        <td>38.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.305</td>
    </tr>
    <tr>
        <td>3</td>
        <td>671</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/second-minimum-node-in-a-binary-tree/">二叉树中第二小的节点</a></td>
        <td>45.0%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.172</td>
    </tr>
    <tr>
        <td>4</td>
        <td>711</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/number-of-distinct-islands-ii/">不同岛屿的数量 II</a>
        </td>
        <td>55.2%</td>
        <td>困难</td>
        <td>1</td>
        <td>1.578</td>
    </tr>
    <tr>
        <td>5</td>
        <td>735</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/asteroid-collision/">行星碰撞</a></td>
        <td>37.3%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.273</td>
    </tr>
    <tr>
        <td>6</td>
        <td>749</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/contain-virus/">隔离病毒</a></td>
        <td>48.8%</td>
        <td>困难</td>
        <td>1</td>
        <td>1.677</td>
    </tr>
    <tr>
        <td>7</td>
        <td>754</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/reach-a-number/">到达终点数字</a></td>
        <td>39.2%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.508</td>
    </tr>
    <tr>
        <td>8</td>
        <td>762</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/prime-number-of-set-bits-in-binary-representation/">二进制表示中质数个计算置位</a>
        </td>
        <td>66.5%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.236</td>
    </tr>
    <tr>
        <td>9</td>
        <td>590</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/n-ary-tree-postorder-traversal/">N叉树的后序遍历</a></td>
        <td>72.0%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.107</td>
    </tr>
    <tr>
        <td>10</td>
        <td>784</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/letter-case-permutation/">字母大小写全排列</a></td>
        <td>62.4%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.134</td>
    </tr>
    <tr>
        <td>11</td>
        <td>793</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/preimage-size-of-factorial-zeroes-function/">阶乘函数后K个零</a>
        </td>
        <td>33.0%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.941</td>
    </tr>
    <tr>
        <td>12</td>
        <td>810</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/chalkboard-xor-game/">黑板异或游戏</a></td>
        <td>52.6%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.991</td>
    </tr>
    <tr>
        <td>13</td>
        <td>880</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/decoded-string-at-index/">索引处的解码字符串</a></td>
        <td>22.0%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.554</td>
    </tr>
    <tr>
        <td>14</td>
        <td>891</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/sum-of-subsequence-widths/">子序列宽度之和</a></td>
        <td>27.1%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.971</td>
    </tr>
    <tr>
        <td>15</td>
        <td>897</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/increasing-order-search-tree/">递增顺序查找树</a></td>
        <td>65.6%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.183</td>
    </tr>
    <tr>
        <td>16</td>
        <td>912</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/sort-an-array/">排序数组</a></td>
        <td>52.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.125</td>
    </tr>
    <tr>
        <td>17</td>
        <td>921</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/minimum-add-to-make-parentheses-valid/">使括号有效的最少添加</a></td>
        <td>70.1%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.214</td>
    </tr>
    <tr>
        <td>18</td>
        <td>937</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/reorder-data-in-log-files/">重新排列日志文件</a></td>
        <td>51.5%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.37</td>
    </tr>
    <tr>
        <td>19</td>
        <td>969</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/pancake-sorting/">煎饼排序</a></td>
        <td>62.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.393</td>
    </tr>
    <tr>
        <td>20</td>
        <td>984</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/string-without-aaa-or-bbb/">不含 AAA 或 BBB 的字符串</a>
        </td>
        <td>35.8%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.442</td>
    </tr>
    <tr>
        <td>21</td>
        <td>991</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/broken-calculator/">坏了的计算器</a></td>
        <td>50.8%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.442</td>
    </tr>
    <tr>
        <td>22</td>
        <td>993</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/cousins-in-binary-tree/">二叉树的堂兄弟节点</a></td>
        <td>49.9%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.205</td>
    </tr>
    <tr>
        <td>23</td>
        <td>1004</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/max-consecutive-ones-iii/">最大连续1的个数 III</a></td>
        <td>47.0%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.289</td>
    </tr>
    <tr>
        <td>24</td>
        <td>1063</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/number-of-valid-subarrays/">有效子数组的数目</a></td>
        <td>61.7%</td>
        <td>困难</td>
        <td>1</td>
        <td>1.493</td>
    </tr>
    <tr>
        <td>25</td>
        <td>1019</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/next-greater-node-in-linked-list/">链表中的下一个更大节点</a>
        </td>
        <td>50.6%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.226</td>
    </tr>
    <tr>
        <td>26</td>
        <td>1041</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/robot-bounded-in-circle/">困于环中的机器人</a></td>
        <td>43.0%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.554</td>
    </tr>
    <tr>
        <td>27</td>
        <td>1081</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/smallest-subsequence-of-distinct-characters/">不同字符的最小子序列</a>
        </td>
        <td>43.5%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.736</td>
    </tr>
    <tr>
        <td>28</td>
        <td>1273</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/delete-tree-nodes/">删除树节点</a></td>
        <td>49.7%</td>
        <td>中等</td>
        <td>1</td>
        <td>1.186</td>
    </tr>
    <tr>
        <td>29</td>
        <td>1226</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/the-dining-philosophers/">哲学家进餐</a></td>
        <td>52.5%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.506</td>
    </tr>
    <tr>
        <td>30</td>
        <td>1221</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/split-a-string-in-balanced-strings/">分割平衡字符串</a>
        </td>
        <td>77.2%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.078</td>
    </tr>
    <tr>
        <td>31</td>
        <td>1242</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/web-crawler-multithreaded/">多线程网页爬虫</a></td>
        <td>33.7%</td>
        <td>中等</td>
        <td>1</td>
        <td>2.097</td>
    </tr>
    <tr>
        <td>32</td>
        <td>1278</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/palindrome-partitioning-iii/">分割回文串 III</a></td>
        <td>54.1%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.765</td>
    </tr>
    <tr>
        <td>33</td>
        <td>1192</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/critical-connections-in-a-network/">查找集群内的「关键连接」</a></td>
        <td>33.9%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.84</td>
    </tr>
    <tr>
        <td>34</td>
        <td>420</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/strong-password-checker/">强密码检验器</a></td>
        <td>14.3%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.708</td>
    </tr>
    <tr>
        <td>35</td>
        <td>618</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/students-report-by-geography/">学生地理信息报告</a></td>
        <td>49.7%</td>
        <td>困难</td>
        <td>1</td>
        <td>1.441</td>
    </tr>
    <tr>
        <td>36</td>
        <td>1130</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/minimum-cost-tree-from-leaf-values/">叶值的最小代价生成树</a></td>
        <td>56.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.533</td>
    </tr>
    <tr>
        <td>37</td>
        <td>831</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/masking-personal-information/">隐藏个人信息</a></td>
        <td>37.2%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.519</td>
    </tr>
    <tr>
        <td>38</td>
        <td>355</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/design-twitter/">设计推特</a></td>
        <td>36.7%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.376</td>
    </tr>
    <tr>
        <td>39</td>
        <td>1282</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/group-the-people-given-the-group-size-they-belong-to/">用户分组</a>
        </td>
        <td>79.3%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.212</td>
    </tr>
    <tr>
        <td>40</td>
        <td>1228</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/missing-number-in-arithmetic-progression/">等差数列中缺失的数字</a>
        </td>
        <td>53.6%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.765</td>
    </tr>
    <tr>
        <td>41</td>
        <td>1279</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/traffic-light-controlled-intersection/">红绿灯路口</a>
        </td>
        <td>62.8%</td>
        <td>简单</td>
        <td>1</td>
        <td>1.29</td>
    </tr>
    <tr>
        <td>42</td>
        <td>1249</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/minimum-remove-to-make-valid-parentheses/">移除无效的括号</a></td>
        <td>53.9%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.199</td>
    </tr>
    <tr>
        <td>43</td>
        <td>1248</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/count-number-of-nice-subarrays/">统计「优美子数组」</a>
        </td>
        <td>46.8%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.508</td>
    </tr>
    <tr>
        <td>44</td>
        <td>1326</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/minimum-number-of-taps-to-open-to-water-a-garden/">灌溉花园的最少水龙头数目</a>
        </td>
        <td>43.4%</td>
        <td>困难</td>
        <td>1</td>
        <td>0.12</td>
    </tr>
    <tr>
        <td>45</td>
        <td>907</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/sum-of-subarray-minimums/">子数组的最小值之和</a></td>
        <td>27.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.352</td>
    </tr>
    <tr>
        <td>46</td>
        <td>507</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/perfect-number/">完美数</a></td>
        <td>37.5%</td>
        <td>简单</td>
        <td>1</td>
        <td>0.161</td>
    </tr>
    <tr>
        <td>47</td>
        <td>718</td>
        <td><a target="_blank" href="https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray/">最长重复子数组</a>
        </td>
        <td>48.4%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.187</td>
    </tr>
    <tr>
        <td>48</td>
        <td>1152</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/analyze-user-website-visit-pattern/">用户网站访问行为分析</a></td>
        <td>30.3%</td>
        <td>中等</td>
        <td>1</td>
        <td>1.713</td>
    </tr>
    <tr>
        <td>49</td>
        <td>1265</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/print-immutable-linked-list-in-reverse/">逆序打印不可变链表</a></td>
        <td>94.6%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.84</td>
    </tr>
    <tr>
        <td>50</td>
        <td>1131</td>
        <td><a target="_blank"
               href="https://leetcode-cn.com/problems/maximum-of-absolute-value-expression/">绝对值表达式的最大值</a></td>
        <td>38.5%</td>
        <td>中等</td>
        <td>1</td>
        <td>0.564</td>
    </tr>
    </tbody>
</table>